One attracting big business to La Niña? (9)
I believe the answer is:
rainmaker
'one attracting big' is the definition.
The definition suggests a singular noun which matches the answer.
'business to la nina?' is the wordplay.
'business' becomes 'maker' (maker is a kind of business).
'to' means one lot of letters go next to another (I've seen this in other clues).
'la nina?' becomes 'rain' (I can't explain this - if you can you should give a lot more credence to this answer).
'maker' put after 'rain' is 'RAINMAKER'.
Can you help me to learn more?
(Other definitions for rainmaker that I've seen before include "Witch-doctor" , "happy to have cloud over his reputation?" .)